Am I wrong? Or should I let this grudge go?

This is what happen I had a best friend and she called me and told me she was pregnant I asked her how far along she thinks she is she told me 2 months I suggested she goes to the doctor asap she told me she was going the following friday. I called her that friday to ask if she went she said no she had to work that really bugged me. Then 2 weeks later she said she was gon to get an abortion she goes and then tells me she's was 7months and I wondering was I wrong for to me mad because there is no way possible a person could mistake 2months for 7 months... what bugs me the most is she could tell everybody else but the person that suppose her best friend... I mean I cut her dramatically from my life and she still expects me to tell every detail of my life like I used but the way I feel is if she couldn't tell me her secrets why should I tell her mines I mean I hate being lied too. And I believe that betrayal is the perfect to end a friendship... Do you think I should let it or not ?